The denial followed recent developments suggesting the insurgents were still in control of some areas within the country after Boko Haram militants launched a series of daring attacks recently.
On Thursday, the extremists attacked a military location in Borno State killing two soldiers.
The insurgents were, however, repelled by soldiers who killed 15 of them, the Army said.
Apart from the two dead soldiers, four others were injured in the attack, Mr. Usman said.
Mr. Buratai spoke on Saturday while responding to questions at a special congress of the FCT Council of the Nigerian Union Journalists, NUJ.
The army chief, who said the military had routed the insurgents and was currently securing the region, said terrorism was complex and called for patience.
Mr. Buratai also called on journalists to show understanding in reporting the insurgency for the sake of national interest.
He said there was mistrust in the past between the media and the army and assured of seamless flow of information as long as it does not affect national security.
Earlier, the Chairman of the FCT Council of the NUJ, Paul Abechi, called for understanding between the military and the media in the interest of the nation.
Mr. Abechi said while Nigerians depended on the military for safety, they also depended on the media for information, urging both parties to work together.
He noted the successes so far recorded in the fight against insurgency in the North East Zone and commended Buratai for providing the required leadership in the campaign.
In his remarks, the National President of NUJ, Waheed Odusile, stressed the need for the army to provide journalists with needed information to enable them report correctly.
Mr. Odusile noted with satisfaction that normalcy was returning to Borno and other parts of the North East Zone and commended the leadership of the army.
He said that the occasional conflict between the military and journalists often arose out of the different roles each party plays for the wellbeing of the society.
The NUJ president described the Nigerian media as patriotic, saying that the media only criticise the military to make it to perform better.